9b+18=7b-20

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Solution for 9b+18=7b-20 equation: 



9b+18=7b-20

We move all terms to the left:

9b+18-(7b-20)=0

We get rid of parentheses

9b-7b+20+18=0

We add all the numbers together, and all the variables

2b+38=0

We move all terms containing b to the left, all other terms to the right

2b=-38

b=-38/2

b=-19

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